Study on Coupling Characteristics of Multiple Thermal Parameters during the Fuel Assembly Steady-State Irradiation in the Test Loop
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摘要: 燃料组件稳态回路辐照考验是研究组件抗辐照性能的关键环节，鉴于回路辐照考验热工参数对试验运行的重要性，本文针对稳态辐照考验回路，结合燃料组件对回路辐照考验热工参数的需求，分析了一次水流量及入口温度发生变化、装置内部存在换热以及不同换热器运行方式下回路系统的关键热工参数耦合特性。研究表明，随着换热器一次水入口温度和流量的下降，主换热器的最大换热功率有明显下降，在严重偏离设计工况下，主换热器换热能力存在不能满足燃料组件辐照运行的风险。同时，辐照装置内部换热对主换热器换热极为不利。在回路运行温度需求较高，而装置内部换热较强情况下，主换热器二次水流量的设计裕量不能低于装置内的热交换比例，且该裕量取值需趋大。两台主换热器并联运行的优势主要体现在较大一次水流量情况，且存在一个较小的一次水流量，使得单台换热器独立运行与两台换热器并联运行时的换热能力一致，低于该流量比例时，两台换热器并联运行时的换热能力反而弱于单台换热器运行。Abstract: The steady-state irradiation in the test loop is a key process to study the anti-irradiation performance of the fuel assembly. In view of the importance of the thermal parameters of the irradiation test loop to the test run, aiming at the steady-state irradiation in the test loop, combined with the requirements of fuel assemblies for the thermal parameters of the steady-state irradiation test, this paper analyzes the coupling characteristics of the key thermal parameters of the loop system under the changes of primary water flow and inlet temperature, the existence of heat exchange in the device and the operation mode of different heat exchangers. The research shows that with the decrease of the primary water inlet temperature and flow rate of the heat exchanger, the maximum heat exchange power of the main heat exchanger decreases significantly. Under the condition of serious deviation from the design condition, there is a risk that the heat exchange capacity of the main heat exchanger can not meet the irradiation operation of the fuel assembly. At the same time, the internal heat exchange of the irradiation device is extremely disadvantageous to the heat exchange of the main heat exchanger. Under the condition that the operating temperature of the loop is high and the internal heat exchange is strong, the design margin of the secondary water flow of the main heat exchanger shall not be lower than the heat exchange ratio in the device, and the margin shall be larger. The advantages of parallel operation of two main heat exchangers are mainly reflected in the large primary water flow, and there is a small primary water flow, which makes the heat exchange capacity of single heat exchanger running independently consistent with that of two heat exchangers running in parallel. When the flow ratio is lower than this, the heat exchange capacity of two heat exchangers running in parallel is weaker than that of single heat exchanger.
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图 1 稳态辐照考验回路示意图
Figure 1. Schematic Diagram of the Test Loop for the Steady-State Irradiation
图 2 燃料组件稳态辐照考验装置结构
Figure 2. The Structure of the Irradiation Device During the Fuel Assembly Steady-State Irradiation Test
图 3 主换热器结构及换热器内一次水和二次水流动情况
Figure 3. The Structure of the Main Heat Exchanger and the Flow of Primary and Secondary Water in the Heat Exchanger
图 4 一次水流量及入口温度变化对主换热器换热功率的影响
Figure 4. The Influence of Primary Water Flow and Inlet Temperature Changes on the Heat Exchange Power of the Main Heat Exchanger
图 5 装置内部换热对主换热器性能的影响
Figure 5. The Effect of Heat Exchange Inside the Device on the Performance of the Main Heat Exchanger
图 6 同流量下单台换热器运行与两台并联运行的换热能力比较
Figure 6. Comparison of the Heat Exchange Capacity Between a Single Heat Exchanger Operation and Two Heat Exchangers Parallel Operation at the Same Flow Rate
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[1] CRAWFORD D C, PORTER D L, HAYES S L, et al. An approach to fuel development and qualification[J]. Journal of Nuclear Materials, 2007, 371(1-3): 232-242. doi: 10.1016/j.jnucmat.2007.05.029 [2] 杨文华,张亮,斯俊平,等. 燃料试样堆内辐照温度设计与实验研究[J]. 核动力工程,2018, 39(6): 43-48. [3] 张坤,陈平,邢硕,等. N36特征化燃料辐照考验及性能评价[J]. 核动力工程,2021, 42(5): 110-113. [4] CARMACK J, GOLDNER F, BRAGG-SITTON S M, et al. Overview of the U. S. DOE accident tolerant fuel development program: INL/CON-13-29288[R]. USA: Idaho National Laboratory (INL), 2013 [5] 魏甫,岳潇,张帅,等. HFETR氦-3变功率辐照考验回路调试中典型问题分析及处理[J]. 核动力工程,2020, 41(S2): 146-148. [6] JENSEN C, FLEMING A. Development of advanced instrumentation for transient testing[J]. Nuclear Technology, 2019, 205(10): 1354-1368. doi: 10.1080/00295450.2019.1627123 [7] 杨文华,赵国正,张亮,等. 高通量工程试验堆辐照试验能力和辐照试验技术[J]. 核科学与工程,2018, 38(6): 986-994. doi: 10.3969/j.issn.0258-0918.2018.06.011 [8] 斯俊平, 杨文华, 童明炎, 等. 再生式换热器的热工特性分析[C]//中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第3册[核能动力分卷（下）]. 绵阳: 中国核学会, 2015. [9] 斯俊平,童明炎,杨文华,等. 换热面裕量对再生式换热器热工特性的影响分析[J]. 科学技术与工程,2017, 17(5): 55-61. doi: 10.3969/j.issn.1671-1815.2017.05.010 -
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